from datetime import datetime
from sqlalchemy.orm import Mapped, mapped_column
from sqlalchemy import String, Text, Integer, DateTime, Index, func
from models.base import Base


class SourceContent(Base):
    __tablename__ = "t_source_content"

    id: Mapped[int] = mapped_column(
        Integer,
        primary_key=True,
        autoincrement=True,
        comment="自动递增的唯一内容ID"
    )

    link: Mapped[str] = mapped_column(
        String(2048),
        nullable=False,
        index=True,
        comment="链接"
    )

    platform: Mapped[str] = mapped_column(
        String(32),
        nullable=False,
        comment="平台"
    )

    content: Mapped[str | None] = mapped_column(
        Text,
        nullable=True,
        comment="内容"
    )

    create_time: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        server_default=func.now(),
        nullable=False,
        comment="创建时间"
    )

    update_time: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        server_default=func.now(),
        onupdate=func.now(),
        nullable=False,
        comment="更新时间"
    )

    # ——可选优化：添加 项目 + 主题 联合唯一索引——
    __table_args__ = (
        Index("link", "link", unique=True),
    )

    def __repr__(self):
        return f"<SourceContent id={self.id} link={self.link!r} platform={self.platform!r}>"